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Finding the Fourth Proportional to 67.05, 100.31 and 39.94

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Solution

The fourth proportional to 67.05, 100.31 and 39.94 is: 59.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.05 : 100.31 = 39.94 : x
  2. Step 2: Convert to fraction form
    67.05/100.31 = 39.94/x
  3. Step 3: Cross multiply
    67.05x = 100.31 × 39.94
  4. Step 4: Simplify right side
    67.05x = 4,006.83
  5. Step 5: Solve for x
    x = 4,006.83/67.05
  6. Step 6: Final answer
    x = 59.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.